William Ladd (disambiguation)

William Ladd (1778–1841) was an American anti-war activist.

William Ladd may also refer to:


 * William E. Ladd (1880–1967), American surgeon
 * William F. Ladd (1896–1980), American major general
 * William Ladd Taylor (1854–1926), American illustrator
 * William Palmer Ladd (1870–1941), American Episcopal priest and scholar
 * William S. Ladd (1826–1893), American politician and businessman